Improvement in wrenches



UNITED STATESl .PATENT OFFICE.

JOHN J. GRANT, OF HARTFORD, CONNECTICUT, ASSIGNOR TOl THE PRATT ANDWHITNEY COMPANY, O F SAME PLACE.

vnvlPROviswnsNT IN wRNcHEs.

Specification forming part of Letters Patent No; l 72,854, datedFebruary 1, 1876; application filed December 16, 1875.

T0 all whom it maycoaem:

Be it known that I, JOHN J. GRANT, of Hartford, in the county ofHartford and State of Connecticut, have invented certain new and usefulImprovements in Tap-Wrenches; and I dov hereby declare that thefollowing is a full, clear, and exact description thereof', whereby aperson skilled in the art can make and use the same, reference being hadto the accompanying drawings, and to the letters of reference markedthereon. Y

Like letters in the figures indicate the same parts. j

'The object of my invention is to provide an adjustable tap or reameiwrench,.which can be at once changed so as to fit different sized tapsor other tools in a more convenient manner than any such tools now inuse.

My invention consists in the construction and arrangement of the severalparts of the mechanism, as will be hereinafter described.

In the accompanying drawing, Figure 1 is a front view of my improvedtap-wrench, with the usual handles partly removed. Fig. 2 is a side viewof the same. Fig. 3 is a front view, with the covering-plate removed toshow the interior parts. Fig. 4 is a side view of the same, with theinterior mechanism shown in dotted lines. Figs. 5 and 6 are a back andedge view of the covering-plate removed from Figs. 3 and 4. Figs. 7, 8,9, 10, 1l, 12 are details, which will be described farther on.

A is a box, usually made in one piece with the handles, and is recessedor cut out interiorly to receive the operating mechanism. B

is a covering-plate screwed onto A to cover andl retain the severalparts when in place. The box A and cover B are each provided with ahole, C, in the middle for the square of a tap to pass through -to thejaws. D D are` the jaws. A front and side view of D are shown in Figs. 7and 8, and a front and side view of D are shown in Figs. 9 and 10. Thesejaws slide back and forth in a slot, E, in the bottom of the box A, sothatthey approach each other or recede in a straight line. Thegriping-face of one of the jaws D is made of a V form, while the other Dis made of a W form, and partially .enters within the V, so as to beadapted to purpose that will be further explained, and

extends through openings in the sides of the box A, so that it can beeasily turned back and forth wit-hv the thumb and fingers. AThecovering-plate B is provided upon its interior side with a circulargroove, b, in which runs the circular projecting flange b upon the wheelF. It is also recessed at a a to receive and support the part a aof thebox A, and at e e to serve as a further guide' for the jaws D D. Theseparts are shown more particularly in Fig. 5. G is a pawl, which servesto lock the wheel F by means of a tooth, which enters into one of thenotches in the rim of the wheel. It is held in its position by means ofa spring, H, and is released, when it is desired to alter the positionof the jaws, bypressing with one of the fingers upon the outerend of G,which lifts the tooth out ofthe way so that the wheel F can rotatefreely'.

--What I claim as my invention is-.

1..'lhe combination ofthe jaws D D', the ratchet-wheel F. with its camsff', andthe pawl G, when arranged within a box, A, substantially asherein described.

2. The combination of the ratchet-wheel F, having a iange, b', and theplate B, having a groove, b, substantially as described. l 3. Thecombination, in a tap-wrench, of the central supports a a for thesliding jaws, with v a socket or, rest, a', in the cover B, for givingthem greater strength, substantially as herein described.

JOHN J. GRAT.

Witnesses THEO. G. ELLIS, WENDELL R. CURTIS.

